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by César Villamizar and Heather Morrison In May 2015 we conducted a pilot study correlating OA APCs and the journal impact factor, using data from 2010, 2013 and 2014. Here are some early results: about 10% of the journals listed in JCR are DOAJ journals over 10% of the journals listed in DOAJ have an...

PLOS ONE's 2015 Impact Factor is expected to rise, the result of its shrinking size. As reported earlier this year, the open access mega-journal has experienced two successive declines in article output, from a peak of 31,509 research papers in 2013 to 28,107 in 2015-a reduction of 3,402 papers or 11%.

Le Web of Science et le JCR n'ont pas les mêmes modalités de calcul de cumul de citations. Les calculs de médianes sur le JCR sont impossibles en raison de la dichotomie des deux produits. On reste bloqué sur des calculs de moyennes parce que le JCR ne permet pas de faire autre chose. Il se contente de mentionner à la marge l'Eigenfactor (sans l'expliquer) et le JIF percentile comme alternatives à ses calculs bruts.

Last Thursday, Elsevier announced CiteScore metrics, a free citation reporting service for the academic community. The primary metric promoted by this service is also aptly named CiteScore and is similar, in many ways, to the Impact Factor. Both CiteScore and the Impact Factor are journal-level indicators built around a ratio of citations to documents.

Associer la littérature grise aux aires d'impact des publications classiques. Peut-être une autre vision de l'Altmetrics ?

Is there a name for that sensation that "it seemed like yesterday ... and yet, also, forever ago"? That's how I felt on learning that it's already / only five years since the " altmetrics manifesto" was published. At last week's 2:AM conference in Amsterdam, the authors of that manifesto were brought together in person for the first time.